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1G desperatley seeking some ecmlink advice

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cptncreme

Probationary Member
29
6
Feb 10, 2017
Austin, Texas
Well i finally got the car i bought put back together, heavily modified 90 talon awd manual. Full race t4 manifold, pt67 turbo, 1000cc injectors, fully ported head and oversized valves, crower 272's and valvetrain, full return style an fuel system with afpr, dual 450's in tank. i just got ecmlink installed and am running SD. I have set the base timing, having trouble getting biss set with the large cams, isc value wont come to roper value. also it wont go closed loop at idle on a consistent basis, brand new 02 sensor. I think it may be the location and the cams. since its a race manifold i had to put the upstream 02 right at the downpipe exit after the turbo. the car idles quite well in open loop, when it does go to closed loop the fuel trims go to -17 and no matter how much i adjust the deadtime, etc, wont change the trims. also the idle goes slightly lower and gets that nice lopey idle. Could I just run an open loop idle? The car is not a daily driver. also when i try to track datalog for the sd table to auto adjust, it says it cant locate the map sensor input, even though i added it to the list and it is there and functioning in the logs, im gonna attach a open loop log and a closed loop for any pointers, very frustrating. weirdly when it goes to closed loop the 02 voltage is like 3.xx volts, thought it should sweep between .1 and .9ish. im an auto technician and its not making sense to me. thanks for any help. have searched alot of different threads, and dont have priveledge to post in tuning section yet.
 

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  • log.2017.03.29-09closed loop idle.elg
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  • log.2017.03.29-09open loop.elg
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Is ECUBoost your MAP sensor? Also can you log your wideband? I didn't see any available to view. Are you able to verify fuel pressure? Dual 450s is very overkill if you're only going to be running a single set of 1000cc injectors. There's a good chance they're keeping it too rich for the o2 to cycle.
 
I do have intake temp, seems to be stuck at 77 for whatever reason, I'm working on getting the wideband added in
 
Is ECUBoost your MAP sensor? Also can you log your wideband? I didn't see any available to view. Are you able to verify fuel pressure? Dual 450s is very overkill if you're only going to be running a single set of 1000cc injectors. There's a good chance they're keeping it too rich for the o2 to cycle.

Agreed on the overkill. Disagree on the open loop issue. His car is hella lean not rich. +30% fuel trims

I do have intake temp, seems to be stuck at 77 for whatever reason, I'm working on getting the wideband added in

You may have a sensor, but it isn't being input into you ECU per you ECU inputs page in link. That would probably help.

Also, is you MAF still connected? You are still getting MAF readings that makes sense which seems odd.

My other points from my first post still stand.
 
No maf. To me seems rich because fuel trim readings are negative indicating the car is trying to pull that % of fuel out correct?? Also on the ad be table I know the horizontal axis is Ron, but what is the vertical, it's not labeled
 
Dude u can not tune with out a wb on log its next to impossible. Your air temp is very important if yr running set tab to all zero but not best thing to do. Get that dam wb installed then go from there also i always tell everyone same thing check timing and cas is not 180 off and volts above 12.5 on running.
 
CREATE A DAMN PROFILE

It sounds like you have a wideband installed but no factory O2. In addition you aren't logging it or using it as a narrow band sim.

Also, I understand that you have an IAT sensor isntalled, but unless you tell it you do, your ECU does not.

FILL OUT THE FORM
What fuel pressure are you running? Link says 37 psi. Seems pretty low.

Odd that you don't have a MAF but your maf values are changing.

Don't reply until you have created a profile and filled out the form.
 
I do have intake temp, seems to be stuck at 77 for whatever reason, I'm working on getting the wideband added in

The wideband should be able to confirm or deny it staying too rich to cycle o2 whenever you get it hooked up. Do you have an aftermarket IAT sensor? I ask because I'm using a GM sensor but if I log the stock one, it sits there at 77. Seems to be the default number if it's not getting a signal.

Fill out the profile and we won't have to ask all of these questions. Last answer until sheet/profile are filled out.
 
Where are you seeing this? High o2 voltages are rich. That's why its at -30% fuel trim on closed loop log.

You are right. The ECU is pulling fuel based on rich O2. I missed the sign.

However his ecu thinks he should have an AFR of 20:1, while his O2 is saying he is rich. Seems like his O2 is wrong. Hence when he goes open loop, it runs fine because the computer is calculating it.
 
Front o2 shouldnt be at 3.7volts either. Should be between 0.2 and 0.8

Seems like the wideband is wired in but isn't input into the ECU correctly and causing the excessive rich readings.
 
You are right. The ECU is pulling fuel based on rich O2. I missed the sign.

However his ecu thinks he should have an AFR of 20:1, while his O2 is saying he is rich. Seems like his O2 is wrong. Hence when he goes open loop, it runs fine because the computer is calculating it.

Correct me if I'm wrong on any of this. I've gotten comfortable with Link but I'm not an expert by any means either. AFREst is just that, an estimate. The ECU could think hes running stoic in open loop based on the settings its looking at even if the car is actually rich/lean.

There's definitely something wrong with the o2 but at least it does move when he uses throttle. On the few I've messed with I've always seen the sensor either work, or not do anything at all. Wiring issue or incorrect sensor maybe?

A friend of mine had overrun issues with a single 450 even though he had an afpr. This car has two of them. If I had to guess based on the little bit of information we have, I would think the fuel settings are actually pretty close to where they need to be but the pumps are keeping it from maintaining the intended fuel pressure. Or are at least contributing to the problem in conjunction with the front o2.
 
From ECMlink:
"Gasoline air/fuel ratio estimate. This is only an estimate! The calculation basically takes airflow per cylinder firing event and divides this by the amount of fuel that should have been injected during that same event. The user has to tell the routine which injector size, deadtime, and fuel specific gravity was used by right clicking on A/F Ratio in the graph legend and selecting “Props”."

Based on his settings, the car thinks it should be lean, but is reading that it is rich because of the jacked up o2 input into the ECU channel without using the narrowband sim. It then pulls fuel and makes it worse. If the OP would fill out a THE form and let us know what paramters he was running it would help.

Looking at it, his Airflowperrev is probably high which isn't helping.
 
Use a good wideband, set it up to log, toss the stock o2 sensor and you'll need to setup a narrow band simulation from your wodeband..Solved a ton of my issues with going in and out of closed loop.
 
Here's how you get help:

Fill out a profile like the others have told you to: http://www.dsmtuners.com/threads/welcome-to-dsmtuners-now-go-create-a-dsm-profile.499707/

Fill out the template: http://www.dsmtuners.com/threads/wa...r-receive-no-replies-from-the-wisemen.443297/

How to fill out the template: http://www.dsmtuners.com/threads/want-log-file-advice-follow-this-template.487240/

I'll say up front, your log/tune is a wreck. The few sensors you do have are not even configured correctly. In order to run Speed Density and tune with any chance of success, you need a properly functioning IAT, MAP and WBO2 sensors. Until those are all wired into ECMlink and functioning, there's very little any of us can do to help tune your car remotely.
 
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